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- W2034720385 abstract "Counting statistics of α particles from three sources, one containing 241 Am; one containing 239 Pu, 241 Am, and 244 Cu; and a source containing 148 Gd, were determined over periods of 1–4000 min. In particular, the two-sample variance or Allan variance was determined for many sample runs. According to a recent theorem, there is a unique relation between the particle-flux spectral noise density and the Allan variance. It was found that for small counting periods, the statistics were Poissonian, corresponding to shot noise of the particle flux. For long periods[Formula: see text], the counting statistics were found to be non-Poissonian, indicating the presence of 1/f noise and (or) Lorentzian noise.The 1/f noise gave flicker floors of (0.5–0.7) × 10 −7 for 239 Pu, (1.0–1.3) × 10 −7 for 241 Am, and 3.0 × 10 −7 for 244 Cm. The Lorentzians were not reproducible in different runs and are probably associated with chemical oxidation-reduction rate processes in the source. The 1/f noise is likely inherent in the process of α-particle decay, indicating that the classical picture of alpha decay as a Poisson process is incomplete. Some forms of quantum 1/f noise associated with the tunnel-emission process are briefly discussed." @default.
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- W2034720385 date "1987-04-01" @default.
- W2034720385 modified "2023-09-27" @default.
- W2034720385 title "Flicker-noise fluctuations in α-radioactive decay" @default.
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- W2034720385 doi "https://doi.org/10.1139/p87-043" @default.
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